Half to george b



(No Model.)

W. S. RICHARDS.

GOMM UTATOR FOR INDUCTION GENERATORS F0 TELEGRAPH LINES.

No. 430.688. Patent dflJune 24, 1890.

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VALTER S. RICHARDS, OF BOSTON, MASSACHUSETTS, ASSIGNOR OF ONE- HALF TO GEORGE B. JAMES, OE SAME PLACE.

COMMUTATOR FOR INDUCTION-GENERATORS FOR TELEGRAPH-LINES.

SPECIFICATION forming part of Letters Patent No. 430,688, dated June 24, 1890.

Application filed October 11, 1889. Serial No. 326,669. (No model.)

To (LZZ whom it may concern: I

Be it known that I, WALTER S. RICHARDS, of Boston, in the county of Suffolk, State of Massachusetts, have invented certain new and useful Improvements in Induction-Generators for Telegraph-Lines, of which the following is a description sufficiently full, clear, and exact to enable any person skilled in the art or science to which said invention appertains to make and use the same, reference being had to the accompanying drawing, forming part of this specification, in which the figure of the drawing is a perspective view of my improved device.

Like letters and figures of reference indicate corresponding partsin the drawing.

My invention relates especially to a device for generating a continuous current of the same direction from the secondary wires of an induction-coil; and it consists in certain novel features, hereinafter fully set forth and claimed, the object being to produce a simpler, cheaper, and more effective device of this character than is now in ordinary use.

The nature and operation of the improvement will be readily understood by all conversant with such matters from the following explanation.

In the drawing, A represents an ordinary induction-coil disposed upon a base-plate B, and provided with connector-posts b d for its secondary wires and similar posts f g for its primary wires. A horizontal shaft h is journaled in standards 6 on a base-plate D, and bears a pulley j, connected by a cross-belt It with an electric or other motor suitable for driving said shaft three thousand revolutions per minute. A wheel m is secured on the shaft, said wheel having one-half of its periphery covered with a copper plate 1), or similar conductive metal. Two vertically -arranged metallic brushes q r are secured to the base-plate, their free upper ends being in engagement with the periphery of the wheel on. A primary battery 0 has a wiret leading from one pole to the primary-wire post g of the coil A. A wire o connects the opposite pole of the battery with the brush q, and a wire w connects the post f of the coil with the companion brush 0", forming a complete circuit of the coil when the brushes (1 7' are in contact with the metal 19 on the wheel m. A

from the battery through the primary wires large wheel on is secured to the shaft 72, and v is provided on its periphery with two strips of conducting metal y z, a space 15 being left between the adjacent ends of said strips. A horizontally-arranged metallic brush 16 is secured byone end to a standard 17 on the baseplate D, its opposite or free end beingin contact with the under side of the face of the wheel 00. A line-wire 18 is secured to the post 17 in electrical contact with the brush 16. A

horizontally-arranged metallic brush 19 is secured by one end to a standard 20, its opposite free end being in contact with the upper side of the wheel as. A line-wire 21 is secured to the standard 20 in contact with the brush 19. A wheel 22 is secured to the shaft at one side of the wheel or, its face being covered with a copper strip 23, which is connected by a narrow strip of metal 24 with the metal strip 3 on the wheeloc. A similar coppercovered wheel 25 is disposed on the shaft at the opposite side of the wheel on, its covering being connected by a strip 26 with the copper plate 2 on said wheel. A vertical metallic brush 29, secured to the base-plate D has its free end in engagement with the metallic cover 23 of the wheel 22. A wire 30 connects the brush 29 with the postb of the secondary Wires of the coil. A similarly-arranged brush 31 has its free end in engagement with the metallic cover of the wheel 25, and awire 32 connects said brush with the post at of the coil. The body of the wheels on the shaft h are preferably constructed of hard rubber or similar non-conducting material. When the electrical circuit is closed and broken in the primary wires of an ordinary induction-coil, alternating currents are produced in the secondary wires, said currents being of opposite direction. When the shaft 71. is rotated, the parts being in the position shown in the drawing, the battery-circuit is closed by the brushes q 7' being in contact with the copper strip 19. A current is thereby induced from the secondary wires passing, respectively, through the wire 30, brush 29, wheel 22, connectingstrip 24, strip y on the wheel as, the brush 19,

and onto the line-wire 21, and through wire 2, brush 31, wheel 25, connecting-strip '20, plate ,2', brush 16, and onto the line-wire 18. As the wheels continue to revolve and the brushes (1 1' leave the copper p on the wheel m and come in contact with theinsulating-body of said wheel, the circuit is broken, setting up another current in the secondary wires of the coil, which would ordinarily be of the opposite direction. The wheel as having, however, at the same time revolved, the brushes 1G and 19 come into contact with the oppoposite strips y and 2', respectively, thus changing the poles of the induced current and toreing the current set up by the breaking of the circuit into the same direction as that set up by the closing of the circuit. The currentin this case, when the circuit is broken, for example, passes through wire 32, brush 31, wheel 25, connecting-strip 26, plate 5, brush 19, and onto line-wire 21, instead of through brush 16 and onto line-wire 18, as when the circuit was closed. The shaft, wheels, and connections form a commutator H, whereby the poles on the induced current are changed as the circuit is alternately made and broken at each semi-revolution of the shaft. The shaft revolvin g at a high rate of speed, as described, a continuous current of the same direction is generated onto the line-wires from the secondary wires of the coil.

Having thus explained my invention, what I claim is In a device of the character described, the commutator l-I, provided with the wheel :12, having the plates 1 ,2, the metal-covered wheels 22 and 25, connected, respectively, with said plates by strips 24 and 26, the wheel on, provided with the plate 2), an induction-coil, an electric battery, brushes connected with the circuit-wires of the battery in engagement with the wheel m, brushes connecting the wheels 22 and 25 with the secondary wires of the coil, brushes connecting the wheel a with the line-wires, and means for actuating said commutator, sul'istantially as described.

\VALTER S. RICHARDS.

Witnesses:

K. DURFEE, 0. M. SHAW. 

